Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics HUST

Wuhan, China

Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics HUST

Wuhan, China

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Song Z.,Huazhong University of Science and Technology | Song Z.,Wuhan University | Chen Z.,China Ship Development And Design Center | Li W.,Huazhong University of Science and Technology | And 3 more authors.
Meccanica | Year: 2016

Parametric instability problem of a rotating shaft subjected to a periodically varying axial force has been studied by using a numerical simulation method—discrete singular convolution. External viscous damping and internal material damping (Voigt–Kelvin model) have been considered. Parametric instability regions have been presented to illustrate the influence of spinning speed and damping. Numerical results reveal that for rotating shafts with no damping, parametric instability regions under different spinning speeds are ‘V’ shapes, and do not vary obviously with spinning speed increasing. While, for rotating shafts with damping, parametric instability regions are enlarged significantly as spinning speed increases. It may be considered that spinning speed has a great effect on parametric instability of rotating shafts with damping, but little influence on that of rotating shafts with no damping. Moreover, the increase of damping results in reduction of parametric instability regions, which is helpful to improve dynamic stability of systems. And it is also found that effects of internal material damping and external viscous damping on parametric instability regions are similar. Compared to the results by using theoretical methods of Floquet and Bolotin, it is observed that the numerical results support Floquet’s method, disagree with Bolotin’s method for parametrically excited rotating shafts. In consideration of Bolotin’s method leading to enlargement of instability regions, it is strongly recommended that Bolotin’s should not be applied to parametric instability analysis of rotating systems. © 2016 Springer Science+Business Media Dordrecht


Guo W.J.,Huazhong University of Science and Technology | Guo W.J.,Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics HUST | Li T.Y.,Huazhong University of Science and Technology | Li T.Y.,Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics HUST | And 3 more authors.
Applied Mechanics and Materials | Year: 2014

Two coupling models, the fluid-structure coupling and the acoustic-structure coupling, have been studied in this paper, in order to describe the free vibration of a fluid-filled cylindrical shell under internal pressure from two different angles. For both models, a new approach to solve the characteristic equation is presented, using the Galerkin method to obtain the natural frequency of each mode. The comparison shows the results of two models are in good agreement. Although the two models are based on different mechanical theories, the mathematic essences are confirmed to be the same, both derived from Bessel functions. © (2014) Trans Tech Publications, Switzerland.


Li W.,Huazhong University of Science and Technology | Li W.,Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics HUST | Li W.,Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration | Song Z.,Huazhong University of Science and Technology | And 2 more authors.
Shock and Vibration | Year: 2015

Dynamic instability of a rotating ship shaft subjected to a periodic axial force is studied by using discrete singular convolution (DSC) with regularized Shannon's delta kernel. The excitation frequency is related to the spinning speed and the number of blades on the propeller. Effects of number of blades, constant term in the periodic force, and damping on dynamic instability regions are investigated. The results have shown that the increase of number of blades and damping could improve the dynamic stability of rotating shaft with damping. The increase of constant term in the periodic force leads to dynamic instability regions shifting to lower frequencies, making the shaft more sensitive to periodic force. Those dynamic instability regions obtained by DSC method have been compared with those by Floquet's method to verify the application of DSC method to dynamic instability analysis of rotating ship shaft. © 2015 Wei Li et al.


Liu J.,Huazhong University of Science and Technology | Liu J.,Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics HUST | Liu J.,Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration | Qiao W.,Huazhong University of Science and Technology | And 8 more authors.
Composites Part A: Applied Science and Manufacturing | Year: 2015

A new method for fabricating glass fiber composite sandwich panel with pyramidal truss cores was developed based on the vacuum assisted resin transfer molding technology. The microstructure and organizations of fabricated sandwich panels were examined by the scanning electron microscope. The out-of-plane compressive tests of composite sandwich panels were performed throughout the temperature range from -60 °C to 125 °C. Then the effects of temperature on the compressive strength, compressive modulus and failure mechanism were investigated and analyzed. Our results indicated that cryogenic temperature resulted in the increasing of the compressive modulus and strength, while high temperature caused the degradation of the compressive modulus and strength. The effect of temperature on failure mode of composite sandwich panel was also observed. Analytical expressions were presented to predict the compressive modulus and strength of composite sandwich panels at different temperatures. © 2015 Elsevier Ltd. All rights reserved.


Qiao W.,Huazhong University of Science and Technology | Sun J.,Huazhong University of Science and Technology | Sun J.,Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics HUST | Xie D.,Huazhong University of Science and Technology | And 2 more authors.
Marine Structures | Year: 2014

Failure assessment diagram (FAD) has great potentials to be a powerful tool to assess the integrity of hull structures. However, the current methodology to obtain the fracture ratio and the load ratio, two axes of FAD, for hull structures is tedious and burden which is one of the major obstacles to advance the further application of FAD. In this paper, a super element is introduced to obtain those two ratios simultaneously in the framework of linear elastic analysis within a single step. Besides, the virtual section closure technique is proposed to compute the reference stress under the inspiration of virtual crack closure technique to compute the stress intensity factor. The capacity of the proposed super element has been assessed by two classic examples of a plate with central crack and a cylinder with circumferential crack. The results obtained from the super element are compared to the corresponding analytical solutions. Finally, the cracked Nishihara specimen (NST-3) was examined and the facture ratio and the load ratio obtained by the super element were compared to those obtained by the global analyses. The comparisons indicate that the proposed super element is accurate. No convergence troubles were encountered. Therefore, the methodology developed in this paper could be a very useful addition to perform the direct analysis on the failure of hull structures due to large crack extensions based on the failure assessment diagram. © 2014 Elsevier Ltd.


He W.,Huazhong University of Science and Technology | Liu J.,Huazhong University of Science and Technology | Liu J.,Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics HUST | Liu J.,Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration | And 3 more authors.
Engineering Fracture Mechanics | Year: 2015

It is necessary to manage the fatigue crack growth (FCG) of engineering structures for ensuring an appropriate reliability level over the entire operational lifetime. This paper deals with an approach to assess the probabilistic life of mixed-mode FCG by coupling of finite element analysis and Kriging-based reliability methods. A simulation program (FCG-System) is developed to simulate the fatigue crack path and to compute the corresponding fatigue life. Kriging-based Monte Carlo simulation method is used to solve fatigue reliability problem with uncertain parameters. Numerical applications dealing with FCG are presented to illustrate the numerical efficiency and accuracy of the proposed approach. © 2015 Elsevier Ltd.


Chai Y.,Huazhong University of Science and Technology | Li W.,Huazhong University of Science and Technology | Li W.,Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics HUST | Li W.,Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration | And 4 more authors.
Ocean Engineering | Year: 2016

It is well known that the standard finite element method (FEM) is unreliable to solve acoustic problems governed by the Helmholtz equation with large wave numbers due to the "overly-stiff" nature of the FEM. In order to overcome this shortcoming, the hybrid smoothed finite element method (HS-FEM) using triangular elements is presented for the two-dimensional underwater acoustic scattering problems. In the HS-FEM, a scale factor α [0, 1] is introduced to establish the area-weighted gradient field that contains contributions from both the standard FEM and the node-based smoothed finite element method (NS-FEM). The HS-FEM can provide a close-to-exact stiffness of the continuous system, thus the numerical dispersion error can be significantly decreased. To handle the underwater acoustic scattering problems in an infinite fluid medium, the bounded computational domain is obtained by introducing an artificial boundary on which the Dirichlet-to-Neumann (DtN) condition is imposed. Several numerical examples are investigated and the results showed that HS-FEM can provide more accurate solutions than the standard FEM. Therefore, the present method can be applied to practical underwater acoustic scattering problems such as sonar mine-hunting and sonar detection in ocean acoustics. © 2016 Elsevier Ltd. All rights reserved.


Chai Y.B.,Huazhong University of Science and Technology | Li W.,Huazhong University of Science and Technology | Li W.,Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics HUST | Li W.,Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration | And 4 more authors.
Applied Acoustics | Year: 2016

It is well known that one key difficulty of solving the boundary-value problems governed by the Helmholtz equation using standard finite element method (FEM) is the loss of accuracy with increasing wave number due to the "numerical dispersion error". In order to overcome this issue, the hybrid smoothed finite element method (HS-FEM) using linear triangular elements is presented to analyze two dimensional radiation problems. An important feature of HS-FEM is the introduction of a scale factor α∈[0, 1] which is designed to establish the area-weighted strain field that contains contributions from both the standard FEM and the node-based smoothed finite element method (NS-FEM). The gradient smoothing technique used in the HS-FEM guarantees the numerical model can provide a close-to-exact stiffness to the continuous system and hence significantly reduces the numerical dispersion error. To solve the acoustic radiation problems in an infinite fluid domain, the HS-FEM is combined with the Dirichlet-to-Neumann (DtN) boundary condition to give a HS-FEM-DtN model for two dimensional acoustic radiation problems. Several numerical examples are given and it is found that HS-FEM can provide more accurate results than FEM with the same mesh. © 2015 Elsevier Ltd. All rights reserved.


Zhang Y.O.,Huazhong University of Science and Technology | Zhang Y.O.,Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics HUST | Zhang T.,Huazhong University of Science and Technology | Zhang T.,Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics HUST | And 2 more authors.
Applied Mechanics and Materials | Year: 2014

A hybrid numerical method of combining Large Eddy Simulation (LES) and Lighthill’s acoustic analogy theory is utilized to simulate the flow-induced noise at low Mach numbers. The aerodynamic noise generated by flow through a cavity, which is similar to a valve, is simulated and the results are validated by comparing with the open literature. In the simulation, the turbulent flow is computed with LES. After this, the flow field simulation results are used to compute the flow-induced noise with Lighthill’s acoustic analogy theory based on the commercial software ACTRAN. Finally, the simulation results of the flow-induced noise, including the sound pressure level and the peak frequencies, are analyzed and compared with experimental data. It is validated that the hybrid method of combining LES and Lighthill’s acoustic analogy theory used in this paper is feasible and reliable in engineering applications. © (2014) Trans Tech Publications, Switzerland.

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